Method for producing bands of aluminium.



s e P 's a ravens. am -nearer vrc'ronnnnnn, or nran rsnornnf, swrrznn- Y r rare rrn'rnen son. raonucrne n L225fi4j I I Specification ofiltctters Patent. i k Patented May-$ 19101,

Etc-Drawing; (itiginelspplicetion flled eeptember at, ten, serial No. 650,505. Divided and this application area February is, me. eria11llo.7,91%.. I To all whom it may concern: 320 C. and then allowed to cool, is drawn Be it known that w'e,"Enw1N RI HARD by rolls at a high tensile strain and under LAUBER, a subject of the Emperor of Gera comparatively small pressure. many, and Ronnn'cvro'ron Names, a citizen The material can best be elongated when eiof the Republic of. Switzerland, both residannealed at the above mentioned. tempera- King at Emmishofen,- Switzerland,have 111-, ture, as it then possesses the highest avail- Y vented new and usef l lmprovements'nin. able tensile strength. As the material retains Methods for fiBroducing: Bands'iof Alumini- ,this strength when becoming cold again, but um;1and wedo' hereby? declare thefollowloses it :iy mechanical treatment, a repeat- 10 ing to be a full, clear, and exact description ed anne ing of the material at the above of the invention, such as-will enable others mentioned temperature becomes necessary 5 skilled in the-art'to which it'appertainslto from time to time. This annealing may be .m'ake anduse the same, beinga'division of performed at suitable intervals during the ,our'I application {for United States patent treatment of the material. As a consequence '-.'15filed Septeinber 2 1,',1911, S;erial No..'650505. the aluminium band can be subjected to so' '1 :3. Methodsfhayebeenf proposed by. which high a tensile strain that it is not only elonl smalllsheets .c'iifl'foils 'ofalumlnium of 0.0003 1 gated, but is also brought in a smooth condiincli'in thickness 'can'be produced. Methods tion to the rolls.

, rh avegalso been proposed by-WhlCh only one Bands consisting of several layers of 12o'+. band; of aluminium" offa thickness less than aluminium may be producedand to avoid the 0.0005-irich, as for instance'0.0003 inch, can drawbacks named and. t0 perngit S v r be produced, which maybe produced a mile, aluminium strips or bands of a thickness more or-lessinlength; a less than 0.0008 inch to be passedbetween According to our invention layers of rolls, a single aluminium band at the last zabands of aluminium'of a thicknessless than period of rolling but before being folded r 3 0.0008 inch, as for instance 0.0003 inch, can into two bands and wound up, is rolled with so gbe, roduced. a mixture consisting of a small amount of 'itherto separate thin strips or bands of lubricant, as oil and a volatile solvent, as

only}. limited length could be producedbenzin, petroleum, turpentine or similar ma- 30 simultaneouslyyon account of a lubricant terlals. So small an amount of fluid is apemployed such as a layer of oil, petrolenm, plied that only a very thin layer of this 35 soapy-water or the like, which was intro- 'limpid liquid and slightly adhering mixture duced between'the layers of metal to pr'ecovers the foil, when leaving the rolls. Thus vent them from becoming rolled together. ,asticking of the two layers to each other is 35 Experiments have proven that these fluids prevented and, on the other hand the layer can be applied a separating layers for of lubricant is too thin to perforate the foil.

" aluminium foil of only about 0.0008 inch The same result can be obtained by introthicknessor more. Strips or bands of less -ducing between the strips or bands, vapor,

thickness becomeperforated like a sieve, by for instancesteam, vapor of oil, alcohol,

40 the employment of these lubricants and by ether or benzin, so that the bands, when reason of the granulation of the metal due passing the rolls are separated from each to the elongation'before ihenters the rolls. other y a very thin and well distributed ifluid by its hydrostatic pres; layer.

I Theiseparatin --surelthen brea s through the weak parts of Thus for instance, the aluminiumband be- 7 t5 theband- A layer of lubricant, as oil, which fore being rolled two-fold is freed from the adheres, to the material from a preceding oil adhering to it from the preceding rolling. elongation exerts the" same. unfavorable Thismay be doneby evaporating the oil, action. Experiments haveproven'-th' t'..the or by washing with a solvent, as benzin.

perforation by. lubricant-(which adheres to Afte'rward a tube provided with a large '50 the-material from the precedingfgrollinfgbenumber of fineopenings is placed between with a thickness oijjthe foil of 0.0006 the bands atthe side where they enter the me I I s rolls.- The tube which may be electrically According to our intent aluminium; heated is supplied with the fluid to be after being annealed by' 'ihe o 270 to. evaporated, cohol or ether for instance,

the same time the prod and a fine layer of vapor, which exerts no hydrostatic pressure is formed thereby between the aluminium bands entering the rolls.

A very thin uniformly distributed, separating layer may also be obtained in the following manner: Bands still of so great a thickness, (0.0008 inch or more) that they are not perforated by the heavier lubricant introduced between them, are freed from their coating of lubricant or oil and Wound up. An easily evaporating fluid is introduced between the layers before or as they enter the rolls. The bands after passing the rolls are wound up tight and the Wound up bands, with the separating layers between the single bands, are heated so that the surplus of separating fluid is evaporated and the remaining part of said fluid in the form of vapor is equally distributed between the bands where it is condensed to a very fine separating layer. The bands separated in this manner may be rolled and drawn to 0.00025 inch, as has been proven by experiments. These bands neither stick to each other nor become perforated.

By rolling several superposed bands at uct is increased, as compared with rolling single bands, moreover the stands the working process better than single bands.

product consisting of several bands What we claim is: I 1. The method of producing aluminium foils in band form, which comprises lubricatmg the surfaces of superposed bands of aluminium, removing the excess of lubricant by washing the bands with a, solvent, repeatedly subjecting the superposed strips to a rolling operation at a slight pressure while the strips are under tension to a thickness less than 0.0008 inch, and annealing the bands at-intervals during the rolling operation. p

2. The method of foils in band form, eating the surfaces of superposed bands of aluminium, removing theexcess of lubricant by washing the bands with benzin, repeatedly subjecting the superposed strips to a rolling operation at a slight pressure while the strips are under tension to a thickness less than 0.0008 inch, and annealing the bands at intervals during the rolling operation.

Intestimony that we claim the foregoing as our invention, we have signed our name in presence of twosubscribing witnesses.

ERWIN RICHARD LAUBER. ROBERT VICTOR NEHER.

Witnesses:

ERNST FISCHER, CARL GUBEOK.

producing aluminium which comprises lubri- 

